Honeywell RTH8500 User Manual page 26

Installing your thermostat
12 Determine your heating/cooling system type.
Important! Heating/cooling system type must be set so that your
thermostat operates properly and does not damage your system.
12a If you have a traditional system (natural gas forced air with A/C),
your hermostat is set up by default to control this system.
12b If your system is:
• Conventional multistage heat and cool
• Any type of heat pump
• Hydronic
• Other
You MUST change the system type by setting system function 0170.
See page 54 to match your thermostat to your system type.
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24
If you are not sure of your
heating/cooling system type
or have other questions,
go to wifithermostat.com